Tie-wire construction for coil springs



J y 2, 1941. E. w. KRUEGERQ 2,250,163

TIE-WIRE CONSTRUCTION FOR COIL SPRINGS Filed Aug. 17, 1939 Patented July 22, 1941 I SPRING Edwin W. Krucger, River Forest, Ill., assignor to Keystone Steel & Wire Company, Peoria, 111., l a corporation of Illinois Application August 17, 1939, Serial No. 290,584

4 Claims.

This invention has reference to an improved tie-wire construction for securing coil springs in assembled relation in bed springs.

The invention has for its principal object to provide a tie-wire which is a narrow and relatively thin band, being of arcuate or curved formation crosswise of the band so as to provide a three-point contact top and bottom with the volutes of the springs; whereby rocking or tilting of the narrow band at the points of contact with the springs is eliminated and thereby avoiding a source of chafing or noise existing in tiewires made of round or flat wire now in use.

The employment of an arched structure in the tie-wires, as a result of the tie-wires being arcuate or curved in cross-section, increases the rigidity and supporting strength of the Wire formation, and will permit a lighter section per foot of tie-wire to be used, aiding the desirable lighter weight per unit assembly, as well as lowering the cost per unit.

A further advantage derived from the use of tie-wires which are arched, or arcuate, or curved in cross-section is that the curved surface on the tie-wires gives an improved appearance after forming on the bed spring. This is due to the fact that the surface blemishes sometimes found in an enameled finish, do not show up as prominently as they do in a flattened wire construction. In other words the general finish of the entire spring assembly is materially improved.

That the invention may be more fully understood, reference is had to the accompanying drawing forming part of this description and illustrating a preferred embodiment of the invention, in which:

Fig. l is a detail view in perspective of a spring and tie-wires embodied in my invention and showing the tie-wires centering and tying both ways of the spring and the tie-wires crimped to hold the coil in place;

Fig. 2 is a detail in elevation showing a plurality of coils and tie-wires assembled as in Fig. 1;

Fig. 3 is an enlarged detail of a portion of a spring and tie-wires, one of the latter shown in section to illustrate the three-point contact with the volutes of the coil, and

Fig. 4 is an enlarged cross-section of a tie-wire showing its arched or arcuate or curved construction.

Like characters of reference denote corresponding parts throughout the figures.

In the drawing the spring or springs are designated 5. When assembled in bed springs,

used.

these springs may be spaced in relation to each other, as may be desired. While I have elected to show a certain type of coil spring known to the trade, it is to be understood that I am not thereby to be limited, as my invention in tie-wire will adapt itself to the various types of springs The tie-wire or wires are designated 6 and they will be employed in the spring assembly in bed springs as heretofore, i. e. they tie hold both ways of the springs and they are crimped, forming seats to hold the coils securely in place, as has been the custom.

The tie-wire is narrow and flat in construction and is arched or arcuate or curved crosswise, as is best seen in Fig. 4. This arched construction provides the convex and concave surfaces 1 and 8 respectively, with converging side edges 9, the corners being preferably curved at H], as shown. Where the tie-wires coincide with the springs they are formed or provided with crimped portions H to provide seats for the coils.

Reference being had to Fig. 3, it will be observed how the three-point contact is made between the tie-wire 6 and the volutes of the spring which will prevent rocking or tilting action at the point of contact between the tie-wire and the spring and in so doing eliminate a source of chafing or noise found in existing round and fiat tie-wires. The top contact between a volute of the spring and the tie-wire is against the convex surface of the tie-wire, as shown; and the lower opposite curved corners ID of the tie-wire bear against a lower volute of the spring.

As pointed out, the arched structure of the tiewire increases the rigidity and supporting strength of the assembly, and likewise due to this strength, will permit a lighter section per foot to be used, aiding the desirable lighter weight per unit assembly, as well as lowering cost.

What I claim is:

1. In a bed spring assembly, in combination, a plurality of coil springs in spaced relation, tiewires arranged in crosswise relation and at points in coincidence with each spring being crimped, forming seats for such spring; the tie-wires having an arched construction presenting upper and lower convex and concave faces, respectively, and with converging side edges and curved corners; said upper convex surface and opposite lower corners providing a three-point contact with upper and lower volutes, respectively, of the spring.

2. A tie-wire construction for bed springs, comprising a narrow band extending between the convolutions of a spring and being crimped intermediate its length to form a seat for the convolutions of the spring above the crimped formation, said band being arched crosswise presenting a convex surface on one face of the band and a concave surface on the opposite face of the band to provide a three point bearing with the adjacent upper and lower volutes of the spring.

3. A tie-wire for springs comprising a narrow arched band extending between the convolutions of a spring and being crimped intermediate its length to form a seat for the convolutions of the spring above the crimped formation, said band having a pair of relatively spaced contact points on one face thereof, and a single contacting point on the opposite face, thereby providing a three point bearing for the adjacent upper and lower volutes of the spring through which the tie-wire passes.

4. In a bed spring assembly in combination, a plurality of coiled springs arranged in spaced relation, tie-wires consisting of narrow arched bands extending between the convolutions of the springs and provided with crimps forming a seat for the, convolutions of the .springs above the crimped formation, each of said narrow arched bands having a pair of relatively spaced contacting points on one face thereof and a medial contacting point on the opposite face to provide a three point contact between the arched bands and the adjacent volutes of the springs through which the narrow arched band passes.

EDWIN W. KRUEGER. 

